1) Parallel Colt (a multithreaded version of Colt)
In Parallel Colt threads are used automatically when computations are done on a
machine with multiple CPUs. Literally zero configuration is needed.
Try Jython scripts in:

Code:

[Tools]->[jhplot examples]->[Multithreading]

2) Complete rewrite of HPlot3D (3D canvas to plot data, functions,
histograms). Now 3D graphics is ~2 times faster using the native Java!

3) All 2D and 3D examples are located in 2 different folders:
Canvas2D and Canvas3D. Look at the menu: